Item deps: fix.

django_etesync/serializers.py

@@ -163,9 +163,8 @@ class CollectionItemDepSerializer(serializers.ModelSerializer):
         fields = ('uid', 'stoken')
 
     def validate(self, data):
-        for item_data in data:
+        item = self.__class__.Meta.model.objects.get(uid=data['uid'])
-            item = self.__class__.Meta.model.objects.get(uid=item_data['uid'])
+        stoken = data['stoken']
-            stoken = item_data['stoken']
         if item.stoken != stoken:
             raise serializers.ValidationError('Wrong stoken. Expected {} got {}'.format(item.stoken, stoken))